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Table of Contents | Search Technical Documentation | References
HomeTDWNAEP Analysis and ScalingInitial ActivitiesClassical Item AnalysisBlock-Level Descriptive Statistics as Defined After Scaling, Grade 4 Mathematics Combined National and State Assessment, by Block and School Type: 2015
NAEP Technical DocumentationBlock-Level Descriptive Statistics as Defined After Scaling, Grade 4 Mathematics Combined National and State Assessment, by Block and School Type: 2015
| Statistic | Type of school1 | Block M3 | Block M4 | Block M5 | Block M6 | Block M7 | Block M8 | Block M9 | Block M10 | Block M11 | Block M12 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Number of scaled items | † | 15 | 15 | 15 | 15 | 16 | 15 | 15 | 15 | 16 | 13 |
| Unweighted sample size | Public | 26,700 | 26,500 | 26,500 | 26,700 | 27,900 | 27,700 | 26,500 | 26,400 | 26,500 | 27,900 |
| Nonpublic | 500 | 500 | 500 | 500 | 500 | 500 | 500 | 500 | 500 | 500 | |
| Weighted average item score2 | Public | .56 | .51 | .63 | .52 | .56 | .60 | .56 | .55 | .54 | .58 |
| Nonpublic | .59 | .58 | .65 | .53 | .62 | .65 | .59 | .57 | .57 | .62 | |
| Weighted average polyserial | Public | .60 | .60 | .64 | .58 | .63 | .63 | .62 | .58 | .55 | .64 |
| Nonpublic | .60 | .59 | .63 | .56 | .62 | .65 | .62 | .55 | .50 | .64 | |
| Weighted alpha reliability | Public | .73 | .75 | .80 | .72 | .79 | .77 | .76 | .70 | .69 | .75 |
| Nonpublic | .72 | .72 | .76 | .67 | .77 | .77 | .74 | .65 | .65 | .73 | |
| Weighted proportion of students attempting last item3 | Public | .91 | .88 | .88 | .89 | .75 | .86 | .92 | .96 | .92 | .96 |
| Nonpublic | .95 | .93 | .94 | .97 | .80 | .95 | .96 | .97 | .96 | .98 | |
| † Not applicable. 1 Nonpublic school sample includes only private schools, including Catholic schools. BIE and DoDEA schools are not included in either the public or nonpublic category. 2 The "Weighted average item score" of polytomous items is standardized to have a scale of 0 to 1 so they are comparable to dichotomously scored items. 3 The "Weighted proportion of students attempting last item" is equal to 1 – (Percent not responding to last item / 100). NOTE: Item statistics in this table are described on the page Blocks of Items. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2015 Mathematics Assessment. | |||||||||||
Last updated 05 November 2021 (ML)